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Stop start works for 1-2 weeks after recharging

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Old Nov 18, 2022 | 04:24 AM
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Stop start works for 1-2 weeks after recharging

Hi all,

On my 2016 c63s I recharge the AMG and stop start works for about 1-2 weeks then it stops kicking in, green A symbol doesn't come up.

I tested battery voltage during idle and during startup and it's fine when stop start isn't working. I find it I do a few short trips that's when stop start doesn't work anymore afterwards.

What could it be? No errors with Carly.

Thanks,


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Old Nov 18, 2022 | 05:16 AM
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Originally Posted by rnbguy
Hi all,

On my 2016 c63s I recharge the AMG and stop start works for about 1-2 weeks then it stops kicking in, green A symbol doesn't come up.

I tested battery voltage during idle and during startup and it's fine when stop start isn't working. I find it I do a few short trips that's when stop start doesn't work anymore afterwards.

What could it be? No errors with Carly.

Thanks,
Well I always disable it. I wouldn’t complain if that happens to me 😬
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Old Nov 18, 2022 | 11:55 AM
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I have the same. 2017 c63s and when the stop-start button is on, there's an amber no stop-start symbol in the dash even with a fully charged battery. No errors showing.
I don't use it anyway but interested to know what causes it.
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Old Nov 18, 2022 | 03:21 PM
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Originally Posted by mars c63s
I have the same. 2017 c63s and when the stop-start button is on, there's an amber no stop-start symbol in the dash even with a fully charged battery. No errors showing.
I don't use it anyway but interested to know what causes it.
Exactly the same in my 2020 C63S - works sometimes, and amber symbol when it doesn't...
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Old Nov 18, 2022 | 09:04 PM
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You use stop/start? You must be the only one. Anyway, there are several parameters that go into when it is active and when it's not. Battery charge state is a big factor. Since it works after you recharge the battery then you likely don't have enough charge when it stops working. If you only drive short distances frequently, then the battery gets depleted and never fully charges. The app for the FL shows the battery state, not sure if the old Me app does that, too, and with the FL we also get alerts on the phone if the battery charge gets too low. Have you ever changed the battery? If this car is still on the original battery then it's likely that your battery is done and needs to be replaced. About 4 years is what you get out of a battery nowadays. Anything longer is questionable or luck.
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Old Nov 19, 2022 | 02:38 AM
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Auto start stop is an *** of a feature.
Are you in comfort mode when this happens? If I remember correctly the *** light goes amber and does not work if I'm not in sport+, I might have remembered wrong though since auto start stop is the first thing I turn off after starting my car.
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Old Nov 19, 2022 | 05:56 AM
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Originally Posted by dctwc63s
Auto start stop is an *** of a feature.
Are you in comfort mode when this happens? If I remember correctly the *** light goes amber and does not work if I'm not in sport+, I might have remembered wrong though since auto start stop is the first thing I turn off after starting my car.
You don't have to turn off *** if you switch to sport+. It's automatically off in all other modes except Comfort and so there's no light cause it's working as intended. The Amber no *** light only comes in comfort mode with the *** switch on, telling you the system is not working. (Or green *** if it is working)
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Old Nov 19, 2022 | 06:00 AM
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Originally Posted by superswiss
You use stop/start? You must be the only one. Anyway, there are several parameters that go into when it is active and when it's not. Battery charge state is a big factor. Since it works after you recharge the battery then you likely don't have enough charge when it stops working. If you only drive short distances frequently, then the battery gets depleted and never fully charges. The app for the FL shows the battery state, not sure if the old Me app does that, too, and with the FL we also get alerts on the phone if the battery charge gets too low. Have you ever changed the battery? If this car is still on the original battery then it's likely that your battery is done and needs to be replaced. About 4 years is what you get out of a battery nowadays. Anything longer is questionable or luck.
Another issue could be the auxilliary battery. We don't actually have an auxilliary battery but it's called that in the warning messages. It's actually a capacitor. I guess if that is burnt out, it affects the start stop.
Now how often we need to change the aux capattery I have no idea.
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Old Nov 20, 2022 | 08:35 AM
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Thanks all, yep I use comfort mode when I'm happy for stop start to kick in. But I need to recharge battery for it to work.

I'm thinking the battery is old, I've only owned the car 2 months, so I suppose the person before me didn't replace it in the last 4 years.
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Old Nov 20, 2022 | 12:48 PM
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Originally Posted by rnbguy
Thanks all, yep I use comfort mode when I'm happy for stop start to kick in. But I need to recharge battery for it to work.

I'm thinking the battery is old, I've only owned the car 2 months, so I suppose the person before me didn't replace it in the last 4 years.
It's the main battery in your trunk. Once you change it your stop start will be on again all the time.
Varta AGM F21 is the OEM battery for our cars.

Last edited by Jimmy_c63s; Nov 20, 2022 at 12:50 PM.
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